A reader writes:
Is there any rule about having to actually attend the a mass that you have said for someone? Does attending somehow increase the grace that the person receives from the mass?
There is no rule that you have to attend a Mass that is being said for a special intention of yours. This is clear from the fact that people often make offerings to religious orders in distant locations to say Masses for their intentions. It is also clear from the Church’s legislation regarding Mass offerings
As you can see, these canons do not make any provisions regarding what the laity of give Mass offerings must do. The burden is all on the priest to make sure that the Mass is celebrated in a timely manner. The faithful are not bound to do anything after they have made the offering. In fact, the Code provides that:
Can. 954
If in certain churches or oratories more Masses are asked to be celebrated than can be celebrated there, it is permitted for them to be celebrated elsewhere unless the donors have expressly indicated a contrary intention.
This means that if your church is getting too many requests for Masses that your priest can e-mail his priest buddy up in Alaska and ask him to celebrate Mass for your intention–unless you indicated otherwise (he’ll also need to PayPal your the Mass offering to his priest buddy in this case; see can. 955).
The Code thus does not envision people having an obligation to attend the Masses celebrated for their intentions.
It may be customary in some places–particular in parish settings–for folks to show up at the Masses being celebrated for their intentions, but this is not required or suggested by the Church’s law.
As to the grace that would be given to a person for whom you are having Mass said, your attendance or non-attendance has no bearing on the intrinsic efficacy of the Mass. The person will receive whatever grace God wants them to have on the basis of having Mass said for them.
That being said, if you do attend then it can show an extra level of concern on your part (you went out of your way to personally unite yourself with the prayers of this Mass for this person) and that can serve as a kind of "extra prayer" that you are "saying" by your actions for your friend.

